Goalkeeper Krul damaged an elbow in training with Holland while Argentina defender Coloccini has returned with a hamstring injury.Krul is likely to be missing for up to three games, while his South American club-mate is a doubt for Monday night’s trip to Everton.Pardew said: ‘We have lost Coloccini twice now on international duty and we have lost Tim.

‘With the technology we have today we want to know what they are doing because we are handing these players over, to an extent on our pay, so we want to make sure they are looked after.’

Defenders Danny Simpson and Ryan Taylor are already sidelined by hamstring and knee injuries respectively, while James Perch, who missed the 1-1 draw with Aston Villa because of a neck problem, is available for Monday.